Drilling machine



Nov. 2, 1943. i 1 scHAuER 2,333,589

" DRILLING MACHINE Filed May 21, 19440 5 Sheets-Sheet l FIG. 6

Nv.,2, 1943.. l.. L. scHAw-:R 2,333,589 K l DRILLING MACHINE Filed May 21, 1940 5 Sheets-Sheet 2 INVENTOR @ce e Mm van ATTORNEY Nov. 2, 1943. l.. L. scHAuER DRILLING' MACHINE Filed May 2l, 1940 5 Sheets-Sheet 3 BY Eb-JTOR M2177 Zaza.;

ATTORNEY Nov. 2, 1943. L.. L. scHAUER 2,333,589

DRILLNG MACHINE Filed May 21, 1940 5 Sheets-Sheet4 INVENTOR e BY w72 Zwam ATTORNEY Nov. 2, 1943.

L. L. SCHAUER DRILLING MACHINE 5 Sheets-Sheet 5 Filed May 21, 1940 INVENTOR A 2e M77 77% ATTORNEY Patented Nov. 2, 1943 I T UNITED STATES rATENT OFFICE DRILLING MACHINE Lawrence Lee Schaller, Wyoming,v Ohio, assignor to The Cincinnati Bickford |Iool Company, Oakley, Cincinnati, Ohio, a corporation of Ohio applicati@ May 21, icio, serial No. 336,371

(ctw-2s) 11 Claims.

This invention relates to portable machine tools and more particularly concerns improvements in a drilling machine thatmay be wheeled from place to place about the workpiece, leveled and locked in the desired location, and the tool spindle accurately located and aligned for the performance of the immediate tooling operation upon the piece. y

A primary aim of the invention is to provide the user with a machine having steadiness and rigidity when brought into working relation with the workpieceV with the additional ladvantage of power and capacity far exceeding the capacity of conventional portable hand tools. Still a'further object of the invention is'to enable the user to eiect a pluralityfof tooling-operations, such as drilling, boring, reaming and'analogous types of operations, at various locations vertically and horizontally inthe workpiece with but Va single transportation operation of the machine as a whole. That is to say, to enable the user to wheel the machine to a position adjacent the workpiece and then level it (with respectto the floor or the plane of the 'workpiece to be operated upon)` and thereafter adjust the tool spindle vertically, horizontally, fand/or angularly as may be desired properly to position the tool with the workpiece. Subsequent operations Aupon the same piece may be performedin rapid sucesssion by readjusting certain of the elements of the machine, on and relative to, the wheeled base of the machine without disturbing the leveled condition of the machine as a whole, By this invention a succession of spaced tooling operations, ,i for example, drilling, may beperformed `withassurance that the different drilled holes are yaccurately located and properly` related to each other. Errors and diculties in alignment and location of a tool incident tothe use of the conventional portable hand tools whether they are supported entirely by the operator or by ashop crane, are eliminated with ,a portable yet rigid machine of the present character.-

A furtheraim ofthe invention is to.prov`ide userswith a practical eilicient-` tool cfs-generous capacity but compact indesign vso thatit may be moved vbodily about the work, and when necessary, placed inside hollow Aworkfpieces and operated therein to perform relativelyfheavy vtooling operationsthat heretofore could not bev accomplished except by"v initially `designing `the workpiece Y inf-several parts, each in a manner capable ofV being conveniently handled and `ma` chined asseparate entities on existing machines of the conventionaltype.`V

With the aid-of this inventionV theY design; of parts and structures has been greatly simplified, for now the largest Yof workpieces maybe castor otherwise fabricated f in'one' piece, and lthereafter accurately machined, not by taking the work -to the tool, but by bringing the tool to the work.

The present invention further aims to fill an existing need now present in manufacturing plants throughout the countryv for a powerful machine intermediate the bench type and the hand ported class'and the much larger class of tools that require, and are set up on, permanent bases and foundations. One important'feature of the instant invention in portablel machines is that the present machine is designed and adapted to perform tooling operations 4upon large wcrkpieces that heretofore .required massive, elaborate,Y and expensiveequipment to perform the most simple tooling operation. For example, a given casting such as an automobile die block, planer bed or punch press base, may and frequentlydoes weigh l0, l5 or 20 tons, and the problem and cost 'of moving such a piece to a iixed machine toolfis in the rst instance, an expensive .understaking Secondly, the machine which is vto perform the operation must of necessity be exceptionally large and strongin order to accommodate the large heavy workpiecesg In consequence, factory overhead and operating costs are disproportionately high for the actual machining done with' existingmethods.

With the aid of this invention, howevergthe heavy workpiece need .beV handled only once,` i. e., blocked upand/or leveled, and one or more machines of the character vhereinafter more fully explained Wheeled to the work, leveled and Vlocked in the` positionr required-for the tooling operation. Several machinesconstructed in accordance with this invention may operate simultaneously upon a single workpiece and in this way expensive and permanently located machinery-is released for. other duty, or` eliminated entirely, and the costs, delaysY and dangers incident to shifting heavy Work` from place to place about the manufacturing plant is likewise eliminated.

In its more specific aspects the invention also aims to provide a drillingmachine in which the drill` spindle is arranged to rotate on a horizontal, axis, which axis may be raised or lowered, shifted laterally relative to any given point upon the wheeled base of the machine, or swung angularly about a vertical axis that lies preferablyin Still a further objective of the invention is to provide a machine in which the user is given a high degree of sureness and xedness in the making of adjustments in spindle location, -both vertically and laterally, relative to the pre-leveled base of the machine to the end that only one attendant is required to operate the machine, thereby dispensing with the need for a staff of operators as are now required to operate crane supported or hand supported power tools.

In attaining the foregoing objectives and others that will become apparent from the following, it is now propo-sed to arrange a.. horizontally disposed tool spindle for translation upon an upstanding rotatable column with the axis of the spindle passing through the columny axis. The immediate support or housing for the lspindle also carries a simplified train of drive gearing, drive motor, and feedr mechanism. by which the spindle may be rotated atV various speeds and fed axially to and from the work.

The revolvable toolV supportingA column is mountedV upon a stub column which5 in turn is slidably mounted on slideways formed upon a wheeled main support or base member.. By virtue of this improved arrangement and relation of elements, the spindle may loe-raised; or lowered, swung angularly completely about the column axis, or shifted laterally from side to side thereby to locate the spindle at the exact point required for the operation without disturbing the main base which is initially leveled and locked in position adjacent the workpiece. For the more heavy tooling operations, wherein the reacting forces may have a tendency to push the tool away from the workpiece, means. are provided, which for convenience. may be in the form of a chain, for tying the tool head of the machine directly to thev workpiece. The chain performs no tool feeding function but is arranged to exert its tensile force` substantially in alignment with the tool spindle so that there is no separation or springing oftheparts.

Other objects and advantages will be inv part `indicated in the following description and in part .rendered apparent therefrom in connection with the annexed drawings.

To enablel others skilled in the art so fully to apprehend the underlying features hereof that they may embody the same in the various ways contemplated by this invention. drawings depicting a preferred typical construction have been annexed' as a part of this disclosure and. in such drawings, like characters of reference denote corresponding. parts throughout all the views, of which- Figure 1 is a side elevational View of the con plete machine embodying principles of this in vention.

Fig. 2 is another side elevational viewof the machine looking toward the spindle end.

Fig. 3 is a plan view of the machine.

Fig. 4 is a side View of the machine with portions thereof shovm in section better to illustrate certain features of the construction.

Fig. 5 is a sectional View of the column traversing mechanism.

Fig. 6 is a sectional View through a portion of the spindle drive train and gear shifting mechanism.

Fig. 7 is a detail View of a preferredl form of spindle start, stop, and reversing control.-

Fig. 8 is a rear View of the machine in working relation with a workpiece.

Fig. 9 is a fragmentary detail view of a modilied form of head clamping construction.

With reference more particularly to Figs. l to Ll, the machine is supported upon a wheeled base member I@ which is nearly square in plan view and has its hollow interior adequately ribbed and reinforced against flexing. The two rear corners of the base have a pair of relatively wide-flanged wheels il journaled therein which support that end ofthe machine a clearing distance from the floor. At the opposite end of the base and midway its sides, a third wheel i2 is journalcd in the arm of a bigfurcated shaft I3 which is revolvable about. a, vertical axis in a housing Id secured to the main base. The upper end of the shaft i3 has secured` thereto-abracket I5 to which a draw handle L6 is pivoted. When the machine-,is being wheeled about, the handleV It occupies la position about asY illustratedl in- Fig. 2, `and is used also as a steering medium for thel forward wheel I2. When not in useas a draft bar, the handle Hi.- may be latched in an upright position as illustrated in dotted lines. The three Wheels accordinglyprovide` a three point contact with they floor ina mannerpromcting easy maneuverability of the machine in close quarters and during the act of transporting the machine about the Shop. They forward single caster i2, being mounted as to turn'. through a complete circle, the. machine may be turned end for end in a narrow compass, and otherwise stationed in practicalily,A any position desired relative. to a workpiece of complex design orl con-tour.

After the machine has been wheeled tothe required tooling station, the three` point contact with the floor,` effected by wheels HI andV t2, is replaced by a fourpoint contact established by the manual` operation of .lacking devices, each of which includes a lockingscrew Il located at eachl corner of the base I-.A Ingasrnuch as the locking screws I1. are all alike, the description will be confined to the one illustrated in section onli-ig 4. g

Each locking screw has. a threaded connectioni3 with the main base and carries at its tweenv the foot I 9. and the shaft Il may bein the lform of a ball and socket type of joint Zil, or any other type that. will allow the footto adjust itselfA to irregularities in the floor.. The floor side of each foot i9 is roughened,` as at 2|...to insure a rm and non-skddine engagement of the machine withthe floor when the handles 22 are operated to lower the locking4 feet andthus raising `the wheels ofthe machine ofi the floor.

Each of the corner jacking devices (Il-.22) arev independently adjustable vertically so. that theV main base IU of the machine may be leveled notwithstanding that the floor may slant or contain Severeirregularities in surface contour at the regionwhere it may be desired to use the machine. Toassist the operator in leveling-'the machine (whereby the tool spindle is also leveled) a pair of'water levels 2,3, 24 areinserted in the base, preferablyflush with the surface I!!a thereof. One of the levels serves to indicate trueness longitudinally and the other level indicates trueness in the transverse directionl or crosswise the machine. When the bubble in each level comes to zero position by the appropriate movement of the corner jacks; the machine as a whole is leveled and. .thetool spindle may be swungI in a complete circle withouterror.

' Swinging of the tool-spindleangularlysis effected in the presentembodimentof the'invention by revolvably. mounting the main 'supporting column 25 upon a normally fixed stub column 26. The stub columnprojectsupwardly inside of the column 25 from a base portion. 21 thereof. The base portion of the stub column has its upper and lower surfaces 2B and 29 finished to provide bearing surfaces, the upper surface 28 being annu.- lar to support thereon the lower end surface 3E of the revolvable cylindrical column 25, and its under surface rectangular .so asto be capable of translation. Radialthrust bearings 3| and '32 located respectively at the top and bottom of the stub column 26 support-and guide the outerA column 25 thereon.

At its extreme lower end, the outer'column` is formed with a projecting -annular flange 33which is overlaid by two guide and clamping straps 34 and 35; Each strap has a heel DOrtOn 36 that engages the base element 2'! and acts as a fulcrum, and a toe portion 31 that overlays the annular flange 33, and between the toe and heel portions ofthe strap, clamp `screws 38 exert their pressure. Preferably both clamp straps are pulled down against the column flange with a moderate pressure suiiicient to prevent any separation between the annularthrust bearing surfaces 2a and 30, and are locked in position by locking means 38a. The pressure exerted by the clamp straps in addition to the normal Weight of the column and parts supported thereby is not sufficient to prevent adjustment of the column angul-arly on the bearing surfaces and, to Yeffect arm clamping of the column in any preselected angular position desired, a lever operated clamp means 39 is provided.

The function of the lever operated means is merely to increase the clamping pressure exerted, by atleast one ofthe clamp straps, to the point of clamping of the column flange 33 firmly against rotation. One or more clamping levers may be provided, but in the event that only one is used, it should be located preferably in that quadrant of the column iiange that tends to lift away from the bearing surface 28 during a tooling operation. Fig. 4 of the drawings illustra-tes the preferred location of the clamp with respect to the tool end of the spindle for the great majority of tooling operations that may be performed with a portable machine of this particular design. y

l The lower bearing surfaces 29 of the stub column -are `at least two in number and lie at either side of the column axis. Complementary square gudeways 40 are provided by the main base and extend longitudinallyv thereof (Figs. 2 and 3).. TheY guideways 40 are preferably located slightly above thegeneral plane of the top of the base and provide angularly disposed bearing surfaces Alla, Mb, MC, 41d for supporting and guiding the complementary surfaces of the stub column slide member 26, 2l. Suitable straps 4I and an adjustable gib ile are provided for establishing and maintaining a close fitting relation of the guides. The fitting of these elements are, asexplained above in connection with the rotatable column, not too tight as to prevent movement of the column slide along the ways of vthe base, but sufficiently tight to Yprevent any lateral separation between any of the bearing surfaces during a tooling operation.

The purpose of the above described type of column mounting is to enable the user to swing the tool spindle to any angular position as the requirements of the Vwork demand andealso to trans- 1ste the' spindle Vlaterally .none the' ways v4ofi the base to new lpositions without disturbing .the previously leveled condition of the base. To facilitatefthe lateralrshiftingof the'spindlealong thev base a rack and pinionl mechanism '42; 43 operatedthrougha worm'and worm whee1"44,.45 is-provided.- :This type of translating mechanism af:l fordsnot only a powerful drive but a drive that is self-locking, i. e., themachine cannot be moved alongthe ways ofthe base unless the handle 46 ofthe wormy drive is manually operated. Auxile iary devices for Aclamping thecolumn slide to the base Iare not essential, although if one desi-res, a clamp constituted along the lines of the'column clamp means 39, previously explained, may easily be provided.- Y

The revolvable column drically throughout the major portion of `its height and supports thereon, forfvertical-mevement, a tool head 50. The girdle portion 5| of the tool head extends completely around the. col.

umn .andis split along one side at .52 (Figs.. 3-

andl). sothat a .close sliding iit- .betweenthe head and column may be obtained'by the ad and split girdle portion of the head.

As illustrated more clearly in `Figs'. 1, 2, and 3, the column cap 54 supports a depending shaft 55 which passes to the outside of the girdle portion proper of the head and through a split Wing 55 carried by the head, preferably 'at the upper'rel gion thereof. The split 56a extends into 'theshaft receiving bore in the wing 55 but not to the inner column" engaging surface of the girdle.' A'draw bolt'form of clamp; operated through'a hand'leverl 51 is providedfor pinching the twofparts of thesplit wing firmly upon the shaft 55. In thiswaythe adjustable headniay be clamped in positionl withoutimparting-or transmitting any of -the clamping force tothesplit-tool head-per-seorto the hollowandlongitudinally `divided column According to the-head clamping structure illustrated -inFig 9, which may bepreferred by some users, the head girdle portion is split on the operators side -of the.. machine, and a clamping is effected in by impinging the girdle portion partly.

on the column and partly on the cap supported rod 55a. In this embodiment of clamp, Yanon.; rotatable but axially shiftable stud 53a passes through the wings of the girdle and carriesatone end a manually operable nut in the form of`a. lever 51a, and at its-otherend, a set of adjust-V able check nuts 51h. Underlying the check nuts,

a rock lever 57? straddles Athedrawbolt and eX- tends to Vopposite sides thereof. One endofthe rocklever Vengages a fixed buttonl 51d Vset into the head girdle, and the opposite end ofthe lever engages an axially niovable pin 57e, yalso mounted in the head girdle. f The p in 'lisjhowever',"

mounted in-a bore'slightly offset with respect to the axis of the cap supported rod 55?, and carries at its inner end a wedge portion 5'If of smaller diameter, to prevent binding in engages directly Withthe rody 552k!j -f 25 is machined` cylin-` the" bore', that? Withl this type of clampr a movement. of the. hand lever 511e to a, clamping position exerts,` an eqnalizing clamping pressure` of the head girdle. on the column 25K as well as on` the rodv 55a, neither element receiving the full eiect'of the clamping pressure, but both sharing the forces jointly. As a consequence, the inner surface 'of the girdle portion of the head is caused to be brought into intimate engagement with the column surfaceV thereby increasing the rigidity throughout, and' the cooperating wedge and shaft members with their locali-Zed but intense clamping effect,v again Serves as' the primary head supporting and clamping medium. Y Y

When the head clamp is operatedito thev released position, the head may be raisedA or lowered on the column by the hand operated screw and nut mechanism illustrated in Figs. l, 3, and, 4. This vmechanism includes a, normally nonrotatable` screwY shaft 58, a rotatable nut 5,9 journaled in the tool head, a hand wheel 6l! and gearing 6l, zratioed to provide approximately 1A" vertical adjustment for each complete turn of the. hand"Y wheel 6|).

Referring more particularly to Figs. I, 3 and' 4,. the mass ofthe tool headj is apportioned' to oppositel sides of the supporting column, the tooling. side supporting the spindle drive, motor 63 and feed mechanism 64. and the opposite side sup.n porting the speed change. gear mechanism B5 and the head eleva-ting mechanism tit-62.. The sub.- stantiallv balanced distribution,ofl the weight. of the tool head at opposite sides. of the central` support promotes. easy translation of the head. along the column. without girdle cramping or column deection effects.

r"he: tool holding spindle 6,6 is rotatably and translatablyv journaled in thetool head 5i] andl passes from onel side of the. head tov the otherthrough the axis of the rotatable column. ByV arranging the spindle and column axes to intersect inthe same plane. stra-in on the head clamp is relieved. the possibility of d-rill breakage eliminated and it. is. possible toV drill a successi-on. of'

holes. all: radiating from a common center, Without repeatedly readj'usting the pivotal axis. .By this improved construction there is noone sided thrust onthe tool head, column, etc. as would be occasionedv if the tool spindle was located offset and' at a tangent to itsv main support.

The above objectives have beenattained byl the present invention by forming oppositelydisposed. longitudinally, extending slots 61 inthe cylindrical column 25, each of which stops short of the upper and lower endsof the. column leaving a substantial portion 61a and 61b extending inwardly from. each end4 of the column, integral and unbroken for increased column.v strength. The column is further strengthened by solid contiguous segment portions (ilc that, extend longitudinally along each side of each. of the slots, E1 and merge with the inner walls of the. column at the upper and lower ends.

The width of theV slots comfortably accommodates not only the tool spindle 66, but its translating sleeve 1l)` by which it is fed to and from thework. The sleeve is translatably mounted in bearings provided in the tool head, and has rack` teeth 1t provided' along one side thereof adapted to mesh with a pinion 12 on a shaft 13; The shaft T8 extends to the front of the head and has a pair'ofpivoted handles 14 connectedl therewith. Manual turning of the` handles thuseifectsspindle ,translation in an axial direction toward or; awayfrom the workpiece.

Additional: spindle translatingmeans are also provided by a hand wheel 15:, which through a shaft 16 anda pair-of bevel gears 11' isarranged to drive a feed shaft 18 also journaled in. the head. The lower end of the feed: shaft 18: carries a worm 19l that meshes with a worm. wheell loosely mounted on the pinionedl shaft13. A clutch 14., arranged for operation by the pivotal movement of levers 14, is. interposed between the worm wheel' 88: and shaft 13` and gives the operator a choice of methods of effecting spindl'etransf lation. Hand wheelV 15 affords a lslow powerfulI spindle feed through the worm. and clutch mechanism, and levers 14 (when the clutch is disengaged) a more direct and faster rate' of spindle traverse. Conventional. depth dial and automatic clutch throw-out mechanisms for regulating the travelof the spindle are provided, but as these mechanisms are well known, their description is believed unnecessary.

lThe tool spindle receives its rotary motions through speed change gearing in a gear box 8l located' at the opposite side of the column. This gearing includes a4 three gear shiftable unit 82 splined to a sleeve 83 that is rotatably journaled in bearings 84 inthe gear box. The sleeve83- is also splined internally and receives the splined end Sii@ of the translatablel spindle 66. y A four gear non-shiftable unit 85 is mounted upon a parallel shaft 86 and receives motion at any one of two different rates from a second sliding twogear unit 81 splined to a third shaft 88. first mentioned sliding unit (82) provides three relatively fine changes in speed and the second mentioned gear unit (81) provides two relatively coarse changes in speed, and as the speed `change mechanisms are in series, a total of six spindle speed changes may be provided with a minimum of gearing.

As illustrated more clearly in Fig. 6, the speed changes are preferably independently selectable through the medium of separate levers 89 and 98. Lever 89 operates shaft 8!!a and shifter fork 89b for sliding gear unit 81', and lever 90 operates sleeve lilla and shifter fork 98h of'sliding unit 82. An index plate and pointer mechanism 9I is provided to expedite the selection of the proper spindle speed.

The splined shaft 88' receives its motion from the motor 63 through shaft 92, gear 93 thereon, and gear 94, the latter being mounted upon the shaft 88.. Shaft couplingsv 92a and 92b are also provided to facilitate manufacturing and assemblingv of the several units and to render ita simple matter for the user to substitute different motors and/ or gear boxes as his specific demands may dictate.

The motor 63 is preferably reversible, and its start, stop or reverse operationl is controlled by a set of switches including. reversing switches` IUI,

|82 and a hand operated lever |03. The handle ID3 has three positions (forward, stop, and reverse) indicated in dotted lines in Fig..'7a1'1d.is4 provided with a spring actuated roller detent mechanism l EM, for resiliently detaining the lever and the switch in a selected position.

After the operator has wheeled the machine to the work. location, leveled it and made theneces sary adjustments properly torelate4 the tool spindle to the Work, a. chain 10.5-, or other convenient form of tie-rod mechanism, may be used to-maintain. the relation between the` tool head and. the

Thel

Vinserted therethrough by means of which Aa positive connection, with respect to the direction of the tooling forces, may be made between the-tool head and workpiece. Such a connection, it will lbe seen, provides additional assurance that the reacting forces of the tooling operation will not spring the machine or any part thereof out of alignment. And in furtherance of this general objective, it is preferred also to position the column axis nearer to one side of the base than the other, suchfas represented in Fig. 1 so that the forces thatgmay tend to overturn themachine areresistedby'the bracing action of the extending larger portions of the base. [It has been found that by placing the column axis "approximately 1A; the distance fromone vedge of the base and 2%; the distance k'from 'the'other edge, highly satisfactory bracing' effects' are obtained without materially affecting the symmetry in design. 'By so offsetting the column 'from the center line of the base of the machine, the nose of the tool spindle'v may becausedto' overhang by a slight amount, any part or portion of the wheeled base, whereby the operator may wheel the machine close to a workpiece anduse the available axial travel ofthe spindle toits fullest extent. Moreover, an offset column provides valuable additional space on the base member I for tools, jigs, andother equipment that ordinarily will accompany a` machine of 4this character in its travels. And so that such equipment will not roll or be jarred oif the machine, the base IEI'is formed with a recess I lil of substantial area within which. the equipment may be placed. Fig. 8 of the drawings is representative of a tooling operation and setup for which the present machine is adapted. In this figure, the workpiece W is a heavy casting weighing many tons and in which it is desired to drill a number of holes. For such an operation the workpiece is rst shimmed upv and leveled on the timbers b and thereafter the-portable machine is wheeled alongside. The machine is correspondingly leveled and anchored in the approximate tooling zone by means of the cornerjacks 22. The proper tool .for the operation is then taken from the tray H and fitted -in the spindle and, by raising or lowering the self-contained tool head on the column, or by shifting the column laterally, or by swinging the column angularly on its slide, or by a combination of movements, the tool is properly located and aligned with respecttothe workpiece. With the various adjusting and clamping features provided in this machine, the operation of locating the tool relative to the work is made relatively a simple matter, compared with the prior methods of shifting' heavy and difficult work. After the first tooling'operation is performed, the tool is easily relocated at another near by region for another` tooling operation without shifting eitherthe work or the machine proper, and where, as in most work, a plurality of holes are to be made within an area of four square feet, the ability to adjust'the spindle vertically and laterally to any point within this range, with accuracy and rigidity; is in itself a highly advantageous feature. Tooling operations upon extra large workpieces maybe performed with equal ease merely by wheeling the machine from one place to another about the work and leveling,

lockingand locating' the spindle ateach change in location as before. f e

Withoutfurther analysis, the foregoing will so fully reveal the gistof this invention that others can by applying current knowledge, readi1y adapt it for various utilizations by retaining one or more of the features that, from the standpoint of the prior art, fairly constitute essential characteristics of either the generic or specific aspects'of this invention and, therefore, such adaptations should be, and are intended to be, comprehended within the meaning and range of equivalency of the following claims.

Having thus revealed this invention, I claim as new and desire to secure the following combinationsand elements, or equivalents thereof, by Letters Patent of the United States:

1. A drilling machine combining a base member, a slide member translatably mounted upon said base, said slide member having a stub column upstanding therefrom, means for translating said slide membery along the base member, a main column member telescoping said stub column and rotatably supported upon said stub column and slide member, said column having a` di'ametral opening therethrough extending longitudinally of the column, an tool head mounted upon and vertically translatable along fsaid main column and rotatable as agunittherewith, said tool head vhaving a portion extending around the column and across the diametral opening in the. column on each side of the column adapted to, journal a tool spindle, a tool spindle rotatably and translatably journaled on a horizontalY axis lin said tool head with the axis of said spindle intersecting the axis of rotation Ao f the supporting column member and said tool spindle extendingthroughv the column opening, and means for clamping said rotatable column to said slide member and said head to said main column thereby definitelyV to position the axis of said Vtool spindle in arpreselected vertical position and inY apreselected/angular` position relative tothe line of movement of said slide on said base. p

2.v A portable machine tool lcombining a base member, manually operable means for removing said base from its engagement with the floor and for leveling same, said means including a series of elevating screws and 'built-in devices for indicating the leveled condition ,of the base in two directions; an upstandingtool supporting column supported by said base member; a tool head slidably .mounted upon said column for vertical adjustment therealong; a tool spindlejournaled in said vertically movable head with its axis normal to and lintersecting the axis of said upstanding column and extending through the column, and said vcolumn being providedA with a diametral opening extending .longitudinally of the column for receiving said spindle therethrough in 'any position of vertical adjustment of the head along'4 the column.

3. A drilling machine combining a base member, a column supporting 'slider element translatable thereon, manually operable means for elevating said base from its engagement with the floor and for leveling same in elevated position, an upstanding, column rotatably mounted on'said slideelementthe axis of saidcolumn being normal tothe plane 'of the base andv definitely. related with said leveling means .at.all times, atool head mounted directly upon said column for ver.-

tical movement thereon, and a rotatable and" translatable tool spindle journaled in said head and extending through the column with the axis 6 aeeeleee extending through an opening between the Walls of said split column, means'for adjusting said head along the split column, means independent of the split column for clamping the head in vertically adjusted position thereby definitely to relieve thesaid split column of the head clamping j' forces and all ndeflection or cramping effects incident thereto, and meansfor rotating thespindle and for translating the spindle axially relative to the column in its vertically adjusted position thereon.

5. A drilling machine combining a divided column memberj 'a tool head movable therealong; said head including a split girdle portion surrounding said divided column and normally positioned on the column with the end portions of the said split girdle approximately 90 anguf larly removed from the plane of the division of said column, means for clamping the head in adjusted position lalong the said column, including a supporting element, clamp means carried by the girdle portion of the head operable vto impinge directly upon said supporting element and simultaneously to contract the girdle portion of thehead closely on said column, and means to operate said clamp means.

6. In a portable machine tool structure adapted to be moved about the floor to a position adjacent the workpiece to beA operated upon the combination of a base member, a tool slide translatable therealong, mounted to said slide; said column having an opening formed inthe side thereof; a tool head vertically movable on the column land rotatable bodily therewith, said head being adapted to'support a tool spindle on an axis paralleling the 4j;

general plane of said base and a portion of which is receivable into the opening formed inv said col.- umn, independently operable means carried by the base and spaced about the margins of said base for accurately leveling the axis of said spindle t and the plane of its swing about the column axis at the particular station adjacent the workpiece to be operated upon to. which the machine has been moved, means forming part of the machine structure and coacting with last named means for indicating the leveled condition of said spindle when in said particular station adjacent the workpiece, and means for translating said leveled spindle vertically on the column, laterally along the base, or axially of itself without disturbing the leveled condition thereof.

7. A drilling machine' combining a base member, a medially split column member mounted upon said base member, a tool head mounted for vertical translation along said split column, a horizontally disposed tool spindle rotatably and translatably `journaled in said tool head, said spindle extending through the opening between the walls of said split column' and adapted to mount a tool at one end thereof, wonn and worm Wheel means carried by said tool head and disposed at the tool side of said column ior translating said spindle, means for 'adjusting said tool an upstanding` column rotatably .head alone. the split Column and ier clamping the tool head .in vertically adjusted position .relative thereto, and means ,including Speed cheese seering at the other end of the tool spindle and at. the Opposite side of, said split, Column for driving the spindle,

8. A machine tool combining a base member, an upstanding tool supporting column supported by said base member, a tool head mounted on said column for vertical movement therealong, a horizontally disposed rotatable and translatable tool spindle iouriialedir-.i ysaid head., power means eerried by and forminga unitary structure with ,said vertically translatable heed for .rotating same; means Carried by and forming a unitary .structure with/.said vertically translatablehead for feeding the spindle axially relative to the head to eiect a tooling operation; and additional means en.-

gageable With said head at a point substantially aligned with spindle feed means therein for bracing said head and column against the reactionary forces of the tooling operation, including means engageable with the workpiece for maintaining a deiinite relation between the position of said head column on the one hand and the position of I the workpiece operated upon on the other.

95A machine toolV having in combination an upstanding rotatable column provided with a 1on-f eitudiiially extending. Opening; a tool heed mounted directly on the said vrotatable column for translation therealong; a rotatable and axially translatable tool spindle extending through the column and J'Qllrnaled in said tool head at opposite sides ofthe column with its 21x15 normal to the axis of the upstanding column; spindle rotating means forming a unitary structure with said tool head for rotating the spindle journaled therein; and feed means also carried by the head for trans-` lating the spindle axially relative to said head and said spindle drive means.

l0. A horizontal drilling machine combining an upstanding column member; a tool head mounted directly on said column, said head having a sleeve portion surrounding said column and said column being provided with a diametral opening there.- through extending axially thereof; a rotatable and axially translatable tool spindle journaled in said head with the axis of the spindle positioned normal to and intersecting the axis of said column, said rotatable and axially translatable spindle extending throug-h the said diametral opening in the column; and means carried by the head member at one side of the column axis for driving said spindle, and means operative at will at the other side of the column axis for translating said spindle. Y

l1. A horizontal drilling machine including an upstanding column, said column having provided therein a diametral opening extending axially; a. tool head mounted directly on said column and adapted for movement therealong; a rotatable and axially translatablespindle journaled in said head with the axis of. the spindle perpendicular to, and in the plane. containing the axis of the upstanding column, said spindle extending into 

